private CacheBlock GetBlock(long blockIndex)
{
if (BlockDict.TryGetValue(blockIndex, out LinkedListNode <CacheBlock> node))
{
if (Blocks.First != node)
{
Blocks.Remove(node);
Blocks.AddFirst(node);
}
return(node.Value);
}
node = Blocks.Last;
FlushBlock(node.Value);
CacheBlock block = node.Value;
Blocks.RemoveLast();
BlockDict.Remove(block.Index);
FlushBlock(block);
ReadBlock(block, blockIndex);
Blocks.AddFirst(node);
BlockDict.Add(blockIndex, node);
return(block);
}
private CacheBlock GetBlock(long blockIndex)
{
if (BlockDict.TryGetValue(blockIndex, out LinkedListNode <CacheBlock> node))
{
if (Blocks.First != node)
{
Blocks.Remove(node);
Blocks.AddFirst(node);
}
// If a supposedly active block is null, something's really wrong
if (node is null)
{
throw new NullReferenceException("CachedStorage cache block is unexpectedly null.");
}
return(node.Value);
}
// An inactive node shouldn't be null, but we'll fix it if it is anyway
node = Blocks.Last ??
new LinkedListNode <CacheBlock>(new CacheBlock {
Buffer = new byte[BlockSize], Index = -1
});
FlushBlock(node.Value);
CacheBlock block = node.Value;
Blocks.RemoveLast();
if (block.Index != -1)
{
BlockDict.Remove(block.Index);
}
FlushBlock(block);
ReadBlock(block, blockIndex);
Blocks.AddFirst(node);
BlockDict.Add(blockIndex, node);
return(block);
}
private CacheBlock GetBlock(long blockIndex)
{
if (BlockDict.TryGetValue(blockIndex, out LinkedListNode <CacheBlock> node))
{
if (Blocks.First != node)
{
Blocks.Remove(node);
Blocks.AddFirst(node);
}
return(node !.Value);
}
// An inactive node shouldn't be null, but we'll fix it if it is anyway
node = Blocks.Last ??
new LinkedListNode <CacheBlock>(new CacheBlock {
Buffer = new byte[BlockSize], Index = -1
});
FlushBlock(node.Value);
CacheBlock block = node.Value;
Blocks.RemoveLast();
if (block.Index != -1)
{
BlockDict.Remove(block.Index);
}
FlushBlock(block);
ReadBlock(block, blockIndex);
Blocks.AddFirst(node);
BlockDict.Add(blockIndex, node);
return(block);
}
